A High-Speed Visible Light Communication System Using Pairs of Micro-Size LEDs

We designed and experimentally demonstrated a spatial diversity visible light communication (VLC) system based on a blue micro-size LED consisting of two parallel pixels. Since the size-dependent effect on the electrical and optical performance of LED, a group of such LEDs with the same structure bu...

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Bibliographic Details
Published in:IEEE photonics technology letters 2021-09, Vol.33 (18), p.1026-1029
Main Authors: Zhang, Shi, Wei, Zixian, Cao, Zhiyuan, Ma, Keming, Chen, Chien-Ju, Wu, Meng-Chyi, Dong, Yuhan, Fu, H. Y.
Format: Article
Language:English
Subjects:
Arrays
Bandwidth
Bit error rate
Communications systems
Current density
Error correction
Light emitting diodes
micro-LED
Optical communication
Orthogonal Frequency Division Multiplexing
Pixels
Silicon compounds
Spatial diversity
Systems design
Visible light communication
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Summary:We designed and experimentally demonstrated a spatial diversity visible light communication (VLC) system based on a blue micro-size LED consisting of two parallel pixels. Since the size-dependent effect on the electrical and optical performance of LED, a group of such LEDs with the same structure but different pixel sizes from 75- {\mu } \text{m} to 175- {\mu } \text{m} diameters are fabricated and packaged to optimize the system. The experimental results showed the trade-off between the modulation depth and bandwidth. Furthermore, the system using a pair of 75- {\mu } \text{m} micro-LEDs can reach up to 1.20-Gbps data rate, which is the highest among the packaged LED group, with the bit-error rate (BER) below the forward error correction (FEC) floor of {3.8 \times 10^{-3}} based on orthogonal frequency division multiplexing (OFDM) and a simple spatial diversity scheme. This work is conducive to the system design based on large-scale micro-LED arrays in the future.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2021.3093339